IO性能工具

一、iotop

1. 用法

# iotop --help
Usage: iotop [-h] [-P] [-d <delay>] [-n <cycles>] [-s <column>]
    -a 显示字节数而非速率
    -d 设置刷新间隔(秒)
    -h 显示此帮助信息
    -m 设置要显示的进程或线程数
    -n 设置退出前的刷新次数
    -P 显示进程数而非默认的线程数
    -s 设置排序依据的列: pid、read、write、total、io、swap、faults、sched、mem 或 delay。

 

2. 示例

iotop -d 5 //统计最近5秒的

iotop -m 4 //循环显示4个线程

iotop -m 4 -n 3 //只循环显示3次

iotop -P -m 4 //以进程为单位进行展示而不是线程

iotop -s faults -m 4 //按faults进行排序，可选的还有 pid, read, write, total, io, swap, faults, sched, mem or delay

# iotop | head -5
                          --- IO (KiB/s) --- --- faults ---  ----------- delayed on ---------- //单位KB/s
   PID Command            read  write  total  major  minor  IO     swap   sched  mem    total
  1165 logcat                0    212    212      0      0  0.00%  0.00%  0.00%  0.00%  0.00%
 26337 peechservice          0     44     44      0   3451  0.00%  0.00%  0.00%  0.00%  0.00%
  2808 queued-work-loo       0     12     12      0      3  0.00%  0.00%  0.00%  0.00%  0.00%

# iotop -a | head -5
                          ---- IO (KiB) ---- --- faults ---  ----------- delayed on ---------- //单位KB
   PID Command            read  write  total  major  minor  IO     swap   sched  mem    total
  1165 logcat                0    240    240      0      0  0.00%  0.00%  0.00%  0.00%  0.00%
  1167 logcat                0     36     36      0      0  0.00%  0.00%  0.00%  0.00%  0.00%
  2921 Thread-4              0     12     12      0      0  0.00%  0.00%  0.00%  0.00%  0.00%

# iotop -m 10
                          --- IO (KiB/s) --- --- faults ---  ----------- delayed on ----------
   PID Command            read  write  total  major  minor  IO     swap   sched  mem    total
  7976 speech_po             0    532    532      0    412  0.00%  0.00%  0.00%  0.00%  0.00%
  7890 native_fsp            0    216    216      0    135  0.00%  0.00%  0.00%  0.00%  0.00%
  1158 cnss_diag             0    192    192      0      0  0.00%  0.00%  0.00%  0.00%  0.00%
  8250 iot.coreservice       0    152    152      0     38  0.00%  0.00%  0.00%  0.00%  0.00%
  8314 iaopeng.smartas       0    152    152      0     38  0.00%  0.00%  0.00%  0.00%  0.00%
  1014 logcat                0     12     12      0      0  0.00%  0.00%  0.00%  0.00%  0.00%
     1 init                  0      0      0      0      0  0.00%  0.00%  0.00%  0.00%  0.00%
     2 kthreadd              0      0      0      0      0  0.00%  0.00%  0.00%  0.00%  0.00%
     3 rcu_gp                0      0      0      0      0  0.00%  0.00%  0.00%  0.00%  0.00%
     4 rcu_par_gp            0      0      0      0      0  0.00%  0.00%  0.00%  0.00%  0.00%
       TOTAL                 0   1256   1256      0    949

注: major fault 应该是从swap中换回内存，而 minor fault 应该是单纯的 page fault.

 

3. 相关命令

# io
ionice                   iorap.cmd.maintenance    iorap.prefetcherd        iorenice
iorap.cmd.compiler       iorap.inode2filename     iorapd                   iotop

 

4. 实验

下面命令创建大量IO, 看统计结果

# time dd if=/dev/zero of=/sdcard/test.file bs=1G count=5
5+0 records in
5+0 records out
5368709120 bytes (5.0 G) copied, 13.336342 s, 384 M/s
    0m13.35s real     0m00.00s user     0m11.20s system